Circuit-interrupter.



B. M. TORMIN. CIRCUIT INTERRUPTEB.

APPLICATION FILED OOT. 'I 1910.

990,790 Patented Apr. 25, 1911.

2 8HBETS-SHEET 1.

THE NORRIS PETERS co., WASHINGTON, n. c.

E. M. TORMIN. CIRCUIT INTERRUPTBR. Arrmouion FILED 00127. 1910.

Patented Apr. 25, 1911.

2 SHEETS-MEET 2.

llllllllllllll I III!" EGMONT MAX TORIVIIN, OF NEWTON CENTER, CABOT ELECTRIC COMPANY, OF BROOKLI MASSACHUSETTS.

MASSACHUSETTS, ASSIGNOR TO HOLTZER- NE, MASSACHUSETTS, A CORPORATION OF CIRCUIT-INTERRUPTER.

Original application filed March 29, 1910, Serial No. 552,125.

Specification of Letters Patent.

Patented Apr. 25, 1911.

Divided and this application filed October 7,

1910. Serial No. 585,807.

To all whom it may concern:

Be it known that I, EeMoNT M. Tonnm. a subject of the Emperor. of Germany, and a resident of Newton Center, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Circuit-Interrupters, of which the following is a specification.

li ly invention relates to circuit interrupters and its object is to provide an apparatus commonly known as a busy-back timer adapted especially for regulating the cadence of the signals produced by a busyback vibrator or other suitable source of varying current, although it is capable of use with a circuit energized by direct current.

The drawings which accompany and form a part of this specification illustrate one embodiment of my invention whereby the above stated object has been realized in practice.

In the drawings-Figure 1 is a diagram showing one mode of connecting the several sets of apparatus illustrated in the other figures. Fig. 2 is a front elevation of one form of apparatus constituting my invention, the cover being shown in section. Fig. 3 is a plan view with the cover removed. Fig. l is a side view of the busy-back timer and Fig. 5 is an inverted plan View of the same. Fig. 6 is a section taken n the line 6 6 of Fig. 4.

In that particular embodiment of my invention illustrated in the drawings, 1 represents a base of hard wood or other suitable material carrying the slab 3, which may be of slate mounted on the brackets 31, which may be secured to the base by screws or other suitable means. Felt washers 32 may be interposed between the brackets and the base and between the slab and the brackets as well as between the slab and the heads of the screws which hold the slab on the brackets.

It is often desirable for many reasons to vary the cadence of the busy signals in telephony as distinguished from arying the frequency thereof. For example, if the frequency of the signaling current is three hundred per second, it is desirable in certain systems that one exchange be provided with apparatus for interrupting the circuit of the vibrator thirty times per minute so that the subscriber will receive a busy signal produced by a plurality of groups, each of 300 pulsations of current having a frequency of three hundred per second, each group being repeated thirty times per min utein other words, a varying current signal having a cadence of thirty per minute; and that other exchanges be provided with similar apparatus for giving different cadences to their busy signals produced by signaling current having a frequency which may or may not be the same as that of the first exchange. It is also sometimes desirable that a single exchange be provided with a plurality of devices for interrupting the varying current produced by a vibrator at different rates or for impressing on such current differentcadences in order to enable the operator to transmit various information to a subscriber, such for instance as the information that the party called does not answer, etc.

In order to regulate the cadence of the busy signals, I provide a timer of novel construction and have shown the same in the present instance mounted on the slab 3. The electromagnets 6 for energizing the timer are mounted on the base 61 of iron and are provided with the cores G3, 63 which extend above the magnets and support the cross-piece 62 of brass or other suitable material. The cores are provided with oppositely arranged grooves 64: which serve as pole pieces for the oscillating armature 66, which in the present case consists of a governor mounted on the vertical rod 65 of hardened steel journaled in the base 61 and cross-piece (52. The governor may be provided with means such as the balls 67 adjustably secured thereto by the screws 68 for assisting in timing the period thereof. A back-stop 69 secured between the core 63 and the cross-piece 62 may be employed to limit the movement of the governor. A vertical rod 7 of steel also journaled between the base 61 and the crosspiece carries at or near its lower end pin 71 to which the spring 72 is connected, and the tension of said spring may be adjusted by the pin 73 which is adjustably secured in the post 74 and which is attached to said spring. Secured near the upper end of the rod 7 is the arm 75 carrying the lateral extension 76 which extends over the governor and is provided with a downwardly extending insulated finger 77 nomil nally eoi'ttacting said governor. The arm 75 at its outer extremity is provided with j an upwardly extending finger '78 arranged i to strike against the leaf-spring 7!) which is attached to the core (33. The stz-ttionaryl contact 8 carried by and insulated from the I core (33 normally is in contact with the. point 81 on the arm 75. A stop 9 mounted on the base 01 may be employed to limit the inward movement of the pin 71.

A. leaf spring 10 mounted on the post 101 carries the contact 102 arranged to coiipj erate with the adjustable contact 103 which is carried by the post 101. The outer end 1 of the spring 10 is connected to the rod by a flexible connection 105 which in the l present instance consists of a silk thread making a half turn around said rod and secured in a hole therein, preferably by knotting the end of the thread, and passing l the same through the hole which may be I tapering. j

lrhen the magnets 0 are energized by the 1 direct current, the governor--21rinature (it; of j soft iron is attracted to the cores ()3, (33 into the grooves (31 which constitute the polepieces for said armature, and thereby the I normally maintained contact between the points 8 and 81 is broken by the armature striking the finger 77 and drawing the arm 75 which carries the contact 81 away from the contact 8. The circuit of the magnets l (3 as more fully explained by reference to f the diagram shown in Fig. 1, is now opened I between the points 8 and S1 and the magnets thereby deenergized, whereupon by the coin bined action of the leaf spring 79, which acts against the upturned finger 78 of the i arm 75, and the spring 72, which through i the pin 71 acts on the pivoted upright rod j 7, the arm 75 is forced back to its normal position so that the circuit of the magnets j is again closed at the points 8 and S1; and at the same time thelingcr 77, which is rigid l with the pivoted rod 7, acts on the governor armature and throws the same outward! away from its pole-pieces with considerable k force so that said armature is carried out- 5 side the magnetic attraction of the magnets. j The partial rotation of the pivoted rod (35 causes the thread 105 to pull on the spring l 10 until the contact is closed at the points l 102 and 103; and the centrifugal action of the governor causes said spring to be slightly bent so that it operates as a lever with the l contact point 103 as a fulcrum. The spring 10 thus serves to limit the motion of the j governor, to bring it to rest and to cause it to move back toward its original position j within the magnetic attraction of the magnets, whereupon, the magnets being energized (the magnet-circuit having been closed at the points 8 and 81) again attract the governor armature and the cycle is repeated.

' sistance R It will be obvious that by suitably varying the adjustable contact screw 103, the tension of the spring 72 and the position of the balls on the governor, the period of oscillation of the latter may be varied throughout a wide range so that a circuit connected in series with the contacts 102, 10 may be opened and closed as many times per minute as desired.

Any suitable source of varying current produced in any suitable manner, as for example, by a vibrator, may be connected in series with the contacts 102, 103.

it is desi able that means he provided for preventing sparking at the contacts 8 and 81. and in the present case I prefer to use for this purpose the non-imluctive resistance R secured to the under side of the slab by brackets such as shown at 13 12-3, together with the condenser C.

The various sets of conductors are brought through the hole 1-11 of the block 1 which is secured to the base 1 and the condensers and inductance connections are joined thereto.

Referring to the diagram shown in Fig. 1,

which shows schematically the various devices above described, and in which the timer mechanism is omitted for clearness, B represents a battery or other suitable source oil current. The circuit carrying the current to be interrupted or varied includes the contacts 102, 103 connected respectively to the posts /L, g. The current for energizing the magnets 0 flows from the battery B to binding post f, contacts 8, 81, arm 75, vertical rod 7, pin 71, spring 72, post 71, and thence through the n'iagnets (3 and back to the battery by way of the post a. Across the contacts 8, 81 the nonin(;luctive reand condenser C are connected in series, the circuit being traced from the contact 81 to resistance R, thence to condenser C, and back to the contact 8 by way of the point a, the function of this arrangement being to prevent sparking at the conacts 8, 81.

This application is a division of my application Serial No. 552,125 tiled lvTtll'Ull 2t), 1910. i

It will be understood that while I have described with some particularity one form of apparatus and circuit arrangements whereby my invention has been successfully practiced, I do not wish to limit myself thereto inasmuch as both the apparatus and circuit ar 'angcments may be subjected to a wide range of variation without departing from the spirit of my invention.

I claim:

1. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, a pivoted armature arranged when in attracted position to open the circuit through said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and other spring means arranged to bring said armature within the magnetic attraction of said electromagnet.

2. In a telephone signaling system, a timer for periodically controlling a signaling circuit comprising in combination, an electromagnet, a pivoted armature arranged when in attracted posit-ion to open the circuit through said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof and means arranged to bring said armature within the magnetic attraction of said electromagnet and to periodically control said signaling circuit.

3. In a telephone signaling system, a timer for periodically controlling a signaling circuit comprising in combination, an electromagnet, a pivoted armature arranged when in attracted position to open the circuit through said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, other spring means arranged to bring said armature within the magnetic attraction of said electromagnet, and means for periodically controlling said signaling circuit carried by said last mentioned spring means.

a. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet,

spring means arranged to move said armature away from said electromagnet and out side the magnetic attraction thereof, and other spring means arranged to bring said armature within the magnetic attraction of said electromagnet.

5. In a telephone signaling system, a timer for periodically controlling a signaling circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and means arranged to bring said armature with in the magnetic attraction of said electromagnet and to periodically control said signaling circuit.

(3. In a telephone signaling system, a timer for periodically controlling a signaling circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, other spring means arranged to bring said armature'wit-hin the magnetic attraction of said electromagnet, and means for periodically controlling said signaling circuit cars ried by said last mentioned spring means.

7. In a telephone signaling system, a timer for periodically closing and opening a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in plane normal to the axis of said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and other spring means arranged to bring said armature within the magnetic attraction of said electromagnet.

8. In a telephone signaling system, a timer for periodically closing and opening a signaling circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and means arranged to bring said armature within the magnetic attraction of said electromagnet and to periodically close and open said signaling circuit.

9. In a telephone signaling system, a timer for periodically closing and opening a signaling circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, other spring means arranged to bring said armature within the magnetic attraction of said electromagnet, and a contact for periodically closing and opening said signaling circuit by said last mentioned spring means. i

10. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, a pair of normally closed contact members in the circuit of said electromagnet, means associated with one of said contact members and arranged to be struck by said arn'iature when in its attracted position to separate said contact members, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and other spring means arranged to bring said armature Within the magnetic attraction of said electromagnet.

11. In a telephone signaling system, a timer for periodically controlling a signal ing circuit comprising in combination an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, a pair of normally closed contact members in the circuit of said electromagnet, means associated with one of said contact members and arranged to be struck by said armature when in its attracted position to separate said contact members, spring means arranged to move said armature away from said electromagnet and outside the magnetic attraction thereof, and means arranged to bring said armature within the magnetic attraction of said electromagnet and to periodically control said signaling circuit.

12. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, a pair of normally closed contact members in the circuit of said electromagnet, a finger carried by one of said contact members and arranged to be struck by said armature when in its attracted position and thereby move one of said contact members away from the other, a spring arranged to be struck by the movable contact member and by its reaction move said armature away from said electromagnet and outside the magnetic attraction thereof, and other spring means arranged to bring said armature within the magnetic attraction of said electro magnet.

13. In a telephone signaling system, a timer for periodically controlling a signaling circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal. to the axis of said electromagnet, a pair of normally closed contact members :in the circuit of said electromagnet, a linger carried by one of said contact members and arranged to be struck by said armature when in its attracted position and thereby move one of said contact members away from the other, a spring arranged to be struck by the movable contact member and by its reaction move said armature away from said electromagnet and outside the magnetic attraction thereof, and means arranged to bring said armature within the magnetic attraction of said electromagnet and to periodically control said signaling circuit.

14.111 a telephone signaling system, a. timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, a pair of normally closed contact mem bers in the circuit of said electromagnet, a pivoted rod carrying one of said contact members, a spring associated with said rod to maintain said members in contact, a finger carried by the movable contact member arranged in the path of said armature, a spring arranged in the path of said movable contact member and adapted by its reaction to move said armature away from said electromagnet and outside the magnetic influence l i l thereof, said last mentioned spring acting on said armature through said movable contact member and said finger, and other spring means arranged to bring said armature within the magnetic attraction of said electron'iagnet.

15.111 a telephone signaling system, a timer for periodically controlling a signaling circuit con'iprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet, a pair of normally closed contact members in the circuit of said electromagnet, a pivoted rod carrying one of said contact members, a spring associated with said rod to maintain said members in contact, a finger carried by the movable contact member arranged in the path of said armature, a spring arranged in the path of said movable contact member and adapted by its reaction to move said armature away from said electromagnet and outside the magnetic influence thereof, said last mentioned spring acting on said armature through said movable contact member and said finger, and means arranged to bring said armature within the magnetic attraction of said electromagnet and to periodically control said signaling circuit.

16. In a tel-eplnme signaling system. a timer for periodically controlling a circuitcomprising in combination, an electromagnet, a pivoted armature arranged when in attracted position toopen the circuitthrmigh said electromagnet, spring means arranged to move said armature away from said electromagn-et and outside the magnetic attraction thereot', other spring means arranged to bring said armature within the magnetic at traction oat said electromagnet and a flexible connection between said last ll'lOlltiOfiGtl spring means and said armature.

IT. in a telephone signaling system, a timer for periodically controlling a signalllg circuit comprising in combination, an electronmgnet, an armature pivoted to oscillate in a plane normal to the axis at said electromagnet, a pair of normally closed contact members in the circuit of said electromagnet, means operated by said armature tor separating said contact members when said arn'iatnre is in attracted positiomspring means arranged to move said armature away from said elcctramagnet and outside the magnetic attraction thereof, other spring means arranged to bring said armature within the nmgnetic attraction of said electromagnet, and means carried by said last mentioned spring means tor controlling said signaling circuit.

18. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet and arranged to open the circuit through said electromagnet when in its attracted position, means for moving said armature away from said electromagnetand outside the magnetic attraction thereof, and other means for bringing said armature within the magnetic attraction of said electromagnet.

19. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the of said electromagnet and arranged to open the circuit through r said electromagnet when in its attracted position, means for moving said armature away from said electromagnet and outside the magnetic attraction thereof, other means for bringing said armature within the magnetic attraction of said electromagnet, and means for varying the natural period of said armature.

20. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the aXis of said electromagnet and arranged to open the circuit through said electromagnet when in its attracted position, means for moving said armature away from said electromagnet and outside the magnetic attraction thereof, other means for bringing said armature within the mag netic attraction of said electromagnet, and

weights secured to said armature for varying the natural period thereof.

21. In a telephone signaling system, a timer for periodically controlling a circuit comprising in combination, an electromagnet, an armature pivoted to oscillate in a plane normal to the axis of said electromagnet and arranged to open the circuit through said electromagnet when in its attracted position, means for moving said armature away from said electromagnet and outside the magnetic attraction thereof, other means for bringing said armature within the magnetic attraction of said electromagnet, and weights secured to said armature and adjustable longitudinally thereof for varying Conies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

